﻿namespace org.apache.lucene.analysis.tr
{

	/*
	 * Licensed to the Apache Software Foundation (ASF) under one or more
	 * contributor license agreements.  See the NOTICE file distributed with
	 * this work for additional information regarding copyright ownership.
	 * The ASF licenses this file to You under the Apache License, Version 2.0
	 * (the "License"); you may not use this file except in compliance with
	 * the License.  You may obtain a copy of the License at
	 *
	 *     http://www.apache.org/licenses/LICENSE-2.0
	 *
	 * Unless required by applicable law or agreed to in writing, software
	 * distributed under the License is distributed on an "AS IS" BASIS,
	 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	 * See the License for the specific language governing permissions and
	 * limitations under the License.
	 */

	using CharTermAttribute = org.apache.lucene.analysis.tokenattributes.CharTermAttribute;

	/// <summary>
	/// Strips all characters after an apostrophe (including the apostrophe itself).
	/// <para>
	/// In Turkish, apostrophe is used to separate suffixes from proper names
	/// (continent, sea, river, lake, mountain, upland, proper names related to
	/// religion and mythology). This filter intended to be used before stem filters.
	/// For more information, see <a href="http://www.ipcsit.com/vol57/015-ICNI2012-M021.pdf">
	/// Role of Apostrophes in Turkish Information Retrieval</a>
	/// </para>
	/// </summary>
	public sealed class ApostropheFilter : TokenFilter
	{

	  private readonly CharTermAttribute termAtt = addAttribute(typeof(CharTermAttribute));

	  public ApostropheFilter(TokenStream @in) : base(@in)
	  {
	  }

//JAVA TO C# CONVERTER WARNING: Method 'throws' clauses are not available in .NET:
//ORIGINAL LINE: @Override public final boolean incrementToken() throws java.io.IOException
	  public override bool incrementToken()
	  {
		if (!input.incrementToken())
		{
		  return false;
		}

//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final char[] buffer = termAtt.buffer();
		char[] buffer = termAtt.buffer();
//JAVA TO C# CONVERTER WARNING: The original Java variable was marked 'final':
//ORIGINAL LINE: final int length = termAtt.length();
		int length = termAtt.length();

		for (int i = 0; i < length; i++)
		{
		  if (buffer[i] == '\'' || buffer[i] == '\u2019')
		  {
			termAtt.Length = i;
			return true;
		  }
		}
		return true;
	  }
	}

}